Stoker



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T0. RILEY STOKER CORPORATION,

F WORCESTER, MASSdCHUSETTS.

STOKER.

Application filed June 23, 1920. Serial No. 391,020.

This invention relates to stokers and particularly to the rear ends of stokers.

An object of the invention is to provide an improved means for carrying the chain around the rear end of the Stoker.

Another object is to provide an improved means for guiding the lower strand of the stoker chain onto the ledge on which it runs.

These and other objects as will appear are accomplished by this invention which is fully described in the following specification and shown in the accompanying drawing of which Figure 1 is a longitudinal section on the line 1-1 of Figure 2, Figure 2 is a partial end elevation and section on the line 22 of Figure 1, showing the chain partly removed and Fig. 3 is a perspective of the shoe.

In the embodiment illustrated, the grate bars 10 are mounted upon a series of parallel chains 10 having central rollers 21 which roll on the corners of angle irons 21 which are carried by the cross channel bars 23 and the rear girder 51. the latter being supported by end plates 26 which are connected to the longitudinal channel bars 26 and 24-, the latter resting on the ledges 25 of the boiler setting.

Each roller 21 is mounted on a pin 21 the outer ends of which carry rollers 21 which are adapted to roll upon the large curved flanges 51', thereby permitting; the chain to turn as shown in Figure 1 and thus doing away with a sprocket shattsuch as is customary for the rear ends otstokers. Because of the inaccessibility as well as the eX- cessive heat and dust it is very ditficult to keep the bearings of such a shaft properly lubricated. This invention substitutes for the inaccessible rear shaft. a series of rollers which are successively brought to the front of the stoker where they can be examined and lubricated when necessary.

As the chain leaves the flanges 51 it forms a bend and passes into the shoe 52 which is pivotally supported on the pin 52 and is so formed as to ride upon the chain rollers. This shoe serves as a lateral. guide for the chain as it enters the lower supporting member 53 where the rollers 21 carry the weight of the chains on the inturned flanges or ledges ot the lower channel supporting members as shown in Figure Thus the weight of the shoe 52 rests upon the chain and serves to tighten it but resists any tendency of the chain to swing to one side and guides it onto the led 'es of the supporting members.

The weight of this pendant section of chain increased slightly by the weight of the shoe 52 is su'liicient to tighten thechain so as to remove the slack from the upper strand which carries the coal and which would otherwise have a tendency to buckle. This tendency is greatly reduced too by the, rollers 21 which decrease friction and cause the chain to move easily. As the chain wears the slack increases. the pendant section sags, lower and lower and the angle it makes with the lower strand increases. The tightener 52 automatically takes care of this. When the slack becomes too great, the chain is shortened by removing a link.

Thus the coal forming the fuel bed G becomes consumed as the upper portion of the chain travels toward the rear and the ash H remaining at the end is dumped into the ash pit J. The lower strand oi the chain travels over the. wall K on which ashes L are deposited forming a seal for air between the space back of the wall K and the pan M which communicates with the atmosphere at the front of the furnace.

While I have shown and described but a single embodiment of my invention it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made which do not depart from the scope of the appended claims in which itis my intention to claim all novelty inherent in my invention as broadly as possible in view of, the prior art.

What I claim as new and desire to secure by Letters Patent is:

1. In a chain grate, a plurality of parallel chains each having a series of links, pins flexibly connecting said links, rollers on the ends of said pins. an end girder having curved flanges on which said rollers may roll, one of said flanges lying on each side of each of said chains, spaced inturned ledges adapted to receive said rollers, said ledges being substantially at the level of the lower edges of said rollers as they leave said flanges, and a hinged shoe for guiding said rollers onto said ledges.

2. In a chain grate, a plurality of parallel chains each having a series of links, pins flexibly connecting said links, rollers on the ends all 3. In a chain grate, a chain having a series of links, pins flexibly connecting said links rollers on said pins, a pair of facing parallel ledges to which said chain is fed and a shoe engaging a swinging section of said chain and guiding it onto said ledges.

JOSEPH HARRINGTON. 

